Band Structure Engineering to Optimize Spin‐Wave Propagation in Weyl ferromagnet Co <sub>2</sub> MnGa <sub>1‐</sub> <i> <sub>x</sub> </i> Ge <i> <sub>x</sub> </i>

Spin waves, the quantized excitations of magnetic order, have been widely explored as low-power information carriers in conventional metallic systems (e.g., NiFe) and insulating materials like yttrium iron garnet (YIG). Recently, magnetic Weyl semimetals (WSMs) have emerged as a novel platform for magnonics, leveraging their unique band structures, strong spin-orbit interactions, and fertile topological behavior. Despite this potential, spin-wave dynamics in magnetic WSMs remain largely uncharted. In this work, this gap is addressed by investigating spin-wave propagation in epitaxial Co<sub>2</sub>MnGa<sub>1-</sub> <sub>x</sub>Ge<sub>x</sub> (0 ≤ x ≤ 1) thin films, a prototypical magnetic WSMs system. By changing the ratio between Ga and Ge, how band-structure engineering, specifically tuning the Fermi level into the minority-spin pseudogap is demonstrated, systematically modulates the electronic and magnetic properties to achieve ultralow Gilbert damping (≈1.5 × 10<sup>-3</sup>) alongside long spin-wave decay lengths over 100 µm. These results establish a generalizable strategy for optimizing spin-wave media while unlocking a materials platform to probe intertwined charge, spin and orbit, with profound implications for next-generation spintronic and magnonic technologies.

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Publication Details

Journal
Advanced Materials
Published
2025-08-22
DOI
https://doi.org/10.1002/adma.202505704
Citations
2
Primary Topic
Magnetic properties of thin films
Type
article
Field-Weighted Citation Impact
2.49

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article

Band Structure Engineering to Optimize Spin‐Wave Propagation in Weyl ferromagnet Co 2 MnGa 1‐ x Ge x

Jilei Chen, Lutong Sheng, Haiming Yu, Yuefeng Yin et al.
2 citations
Advanced Materials
Magnetic properties of thin films
2.49
article

Band Structure Engineering to Optimize Spin‐Wave Propagation in Weyl ferromagnet Co 2 MnGa 1‐ x Ge x

Jilei Chen, Lutong Sheng, Haiming Yu, Yuefeng Yin, Simon Granville, Junfeng Hu, Xiangrui Meng, Tianyu Yang, Song He, Ziyue Xu, Xiaozhen Sun, Nikhil V. Medhekar, Song Liu, Jinlong Wang, Yao Zhang, Peng Li, Peng Dong Gao, Dapeng Yu
article en
2 citations

Abstract

Spin waves, the quantized excitations of magnetic order, have been widely explored as low-power information carriers in conventional metallic systems (e.g., NiFe) and insulating materials like yttrium iron garnet (YIG). Recently, magnetic Weyl semimetals (WSMs) have emerged as a novel platform for magnonics, leveraging their unique band structures, strong spin-orbit interactions, and fertile topological behavior. Despite this potential, spin-wave dynamics in magnetic WSMs remain largely uncharted. In this work, this gap is addressed by investigating spin-wave propagation in epitaxial Co<sub>2</sub>MnGa<sub>1-</sub> <sub>x</sub>Ge<sub>x</sub> (0 ≤ x ≤ 1) thin films, a prototypical magnetic WSMs system. By changing the ratio between Ga and Ge, how band-structure engineering, specifically tuning the Fermi level into the minority-spin pseudogap is demonstrated, systematically modulates the electronic and magnetic properties to achieve ultralow Gilbert damping (≈1.5 × 10<sup>-3</sup>) alongside long spin-wave decay lengths over 100 µm. These results establish a generalizable strategy for optimizing spin-wave media while unlocking a materials platform to probe intertwined charge, spin and orbit, with profound implications for next-generation spintronic and magnonic technologies.

Advanced MaterialsVol. 37(45)
University of Science and Technology of China (CN), Victoria University of Wellington (NZ), ARC Centre of Excellence in Future Low-Energy Electronics Technologies (AU), Quantum Design (Germany) (DE), Beijing Academy of Quantum Information Sciences (CN), Monash University (AU), Beihang University (CN), MacDiarmid Institute for Advanced Materials and Nanotechnology (NZ)
National Natural Science Foundation of China, National Key Research and Development Program of China, Shenzhen Science and Technology Innovation Program
Openalex Percentile: Top 10%
Magnetic properties of thin films
2.49
DOISourceOpenAlex
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